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Home >> Lexus >> 2008 >> GS 350 RWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter >> Meter / Gauge System >> Fuel Gauge Malfunction >> Inspection Procedure

Inspection Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL METER OPERATION) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester ON.
    4. Enter following menus: Body Electrical / Combination Meter / Active Test.
    5. Check the operation by referring to the table below.

      Combination Meter: 

      TESTER DISPLAY REFERENCE CHART

      Tester Display Test Part Control Range Diagnostic Note
      Fuel Meter Operation Fuel receiver gauge EMPTY, 1/2, FULL -

      OK: 

      Needle indication is normal. 

    NG : REPLACE COMBINATION METER 

    OK : Go to next step 

  2. READ VALUE USING TECHSTREAM (FUEL INPUT) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester ON.
    4. Enter following menus: Body Electrical / Combination Meter / Data List.
    5. Check the values by referring to the table below.

      Combination Meter: 

      TESTER DISPLAY REFERENCE CHART

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Fuel Input Fuel input signal Min.: 0, Max.: 255 Fuel gauge indicates (F): 47
      Fuel gauge indicates (3/4): 92
      Fuel gauge indicates (1/2): 148
      Fuel gauge indicates (1/4): 187
      Fuel gauge indicates (E): 205      		 -

      OK: 

      Fuel value signal displayed on the tester is almost the same as needle indication. 

    NG : REPLACE COMBINATION METER 

    OK : Go to next step 

  3. INSPECT FUEL SENDER GAUGE ASSEMBLY (MAIN) 
    1. Disconnect the U9 fuel sender gauge connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage: 

      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      U9-2 - U9-3 Engine switch on (ACC) or on (IG) 10 to 14 V
    3. Remove the fuel sender gauge assembly.
    4. Connect the fuel sender gauge connector.
      Fig 1: Identifying U9 Fuel Sender Gauge Connector Terminals
      G05299347Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Check that the float position is between E and F.
    6. Measure the resistance between the terminals 2 and 3 of connector of the connector.

      Standard resistance: 

      STANDARD RESISTANCE

      Float level Float Position mm (in.) Specified Condition
      F 51.4 (2.02) to 57.4 (2.26) 6.5 to 8.5 Ω
      E 121.7 (4.79) to 127.7 (5.03) 237.6 to 242.6 Ω
      Fig 2: Checking That Float Position Is Between E And F
      G05299348Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE FUEL SENDER GAUGE ASSEMBLY 

    OK : Go to next step 

  4. INSPECT FUEL SENDER GAUGE ASSEMBLY (SUB) 
    1. Disconnect the V11 fuel sender gauge connector.
    2. Measure the voltage of the wire harness side connector.

      Standard voltage 

      STANDARD VOLTAGE

      Tester Connection Condition Specified Condition
      V11-2 - V11-3 Engine switch on (ACC) or on (IG) 10 to 14 V
    3. Remove the fuel sender gauge assembly.
    4. Connect the fuel sender gauge connector.
      Fig 3: Identifying V11 Fuel Sender Gauge Connector Terminals
      G05299349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Check that the float position is between E and F.
    6. Measure the resistance between the terminals 2 and 3 of connector of the connector.

      Standard resistance 

      STANDARD RESISTANCE

      Float level Float Position mm (In.) Specified Condition
      F 69.9 (2.75) to 75.9 (2.99) 6.5 to 8.5 Ω
      E 103.1 (4.06) to 109.1 (4.30) 167.9 to 171.9 Ω

    NG : REPLACE FUEL SENDER GAUGE ASSEMBLY 

    Fig 4: Checking That Float Position Is Between E And F
    G05299350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step 

  5. CHECK HARNESS AND CONNECTOR (BETWEEN COMBINATION METER AND FUEL SENDER GAUGE (MAIN)) 
    1. Disconnect the U9 fuel sender gauge connector.
    2. Disconnect the K31 meter connector.
    3. Measure the resistance of the wire harness side connector.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      K31-19 - U9-2 Always Below 1 Ω
      U9-2 - Body ground Always 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 5: Checking Harness And Connector (Between Combination Meter And Fuel Sender Gauge (Main))
    G05299351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step 

  6. CHECK HARNESS AND CONNECTOR (BETWEEN FUEL SENDER GAUGE (SUB) AND FUEL SENDER GAUGE (MAIN)) 
    1. Disconnect the U9 fuel sender gauge connector.
    2. Disconnect the V11 fuel sender gauge connector.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      U9-3 - V11-3 Always Below 1 Ω
      V11-3 - Body ground Always 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Checking Harness And Connector (Between Fuel Sender Gauge (Sub) And Fuel Sender Gauge (Main))
    G05299352Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : Go to next step 

  7. CHECK HARNESS AND CONNECTOR (BETWEEN COMBINATION METER AND FUEL SENDER GAUGE (SUB)) 
    1. Disconnect the V11 fuel sender gauge connectors.
    2. Disconnect the K31 meter connectors.
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      STANDARD RESISTANCE

      Tester Connection Condition Specified Condition
      V11-2 - K31-34 Always Below 1 Ω
      K31-34 - Body ground Always 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 7: Checking Harness And Connector (Between Combination Meter And Fuel Sender Gauge (Sub))
    G05299353Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : REPLACE COMBINATION METER 

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